666266161 has 16 divisors (see below), whose sum is σ = 732585600. Its totient is φ = 600929280.

The previous prime is 666266143. The next prime is 666266189. The reversal of 666266161 is 161662666.

It is a cyclic number.

It is not a de Polignac number, because 666266161 - 2⁷ = 666266033 is a prime.

It is a super-3 number, since 3×666266161³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666269161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1367860 + ... + 1368346.

It is an arithmetic number, because the mean of its divisors is an integer number (45786600).

Almost surely, 2^666266161 is an apocalyptic number.

It is an amenable number.

666266161 is a deficient number, since it is larger than the sum of its proper divisors (66319439).

666266161 is a wasteful number, since it uses less digits than its factorization.

666266161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224.

The product of its digits is 93312, while the sum is 40.

The square root of 666266161 is about 25812.1320506463. The cubic root of 666266161 is about 873.4054927298.

The spelling of 666266161 in words is "six hundred sixty-six million, two hundred sixty-six thousand, one hundred sixty-one".